As everybody in this world I get confronted with big data and with my background as a DBA I needed more than "ok, this is mongodb and you use it like this" or "this is reddis and this is the manual".
It took me a while to get some good resources but there is one in particular I want to share with you. Ilya Katsov wrote a must read article on his blog called NoSQL data Modeling. I recommend reading it before you start playing with NoSQL. It will influence you on how you will think about the data and how you will put it into the database which has a direct impact on the performance it.
You can find the blogpost at http://highlyscalable.wordpress.com/2012/03/01/nosql-data-modeling-techniques/